SORRY that was supposed to be 1tbs per quart of zinc.so 7 tbs total.
The drop in mpgs could be due to the cat having issues. Id say spend the cash and get it swapped and we can address and additional issues then. Until then we are doing with skewd data
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2002 Dakota aka Winnie aka Mad Max
1996 Grand Cherokee aka Puddles aka Pikey Life
Originally Posted by kg6mov View Post
A bit off topic I know.
I don't think the ZDDP is the overheating issue though. Zinc and phosphate poison the cat so it stops reacting. It just stops working.
If you are using any of the gasoline engine modern oils they probably have less than 800 ppm ZDDP so you'd be fine with your 1 tbsp.
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